Process and device for drying tubular bodies



May 20, 1930. 055 1,759,495

PROCESS AND DEVICE FOR DRYING TUBULAR BODIES Filed March 28, 1929 2 Sheets-Sheet 1 attozmga.

May 20, 1930. J. voss PROCESS AND DEVICE FOR DRYING TUBULAR BODIES Filed March 28, 1929 2 Sheets-Sheet 2 Patented Maze. 0. l

UNITED m s PATENT; OFFICE mania voas, or wm smmr-nmmcn, emm, assrenoa r mm: a co. Ax rrmwensnuscnur, or wmsmm nmmon, GERMANY T300188 AND DEVICE 1'03 DRYING TUBULAR BODIES I Application fled larch 88, 1989, Serial No. 850,68}, and in Germany September 16, 1927.-

The present invention relates to process and device for drying tubular b ies.

Various processes are kno for; drying tubular bodies, for instance sausage casmgs, 5 i. e. skins, guts, tubular bodies made of cellulose 'or the like by fastening the ends of measured pieces of the tubular bodies of a relatively short length, mostly one of a few meters, to the front-walls of a drying chamber, while hermetically closing one end and blowing air into the other end so that the tubular body is inflated, and then drying it by the action of air or hot gases. This process involves much manual labor and there 'are obtained dry tubular bodies of at best only a few meters length. Said process is, therefore, not suitable if it is inten ed to dry tubular bodies having a length of several hundreds of meters, such as they are for instance obtained by spinning viscose by means of an annular nozzle.

I have found that tubular bodies of considerably greater length can be dried by passin 'them through a drying chamber in an inflated state instead of treating the wet tubular body in a drying chamber while at rest by inflating it, so that it enters one end of the drying chamber, while being wet and leaves the drying chamber at'the other end, in a dry state.

It is necessary to conduct the air which is I needed for inflating the wet tubular body, through the already dried tubular body so that also" the latter is always inflated.

The followi'n examples serve to illustrate the invention, ut they are not intended to limit it thereto:

Fig. 1 is a schematic drawing of a device wherein the material passes through the dry- 43 ing chamber once.

Fig. 2 is a modification of Fig. 1 wherein the material passes through'the drying cham' ber a number of times.

Fig. 3 is a cross-section of a modified de- 42: vice wherein the tubular body to be dried passes through the dryin chamber in a spiral a number of times, and ig. 4 is a horizontal plan of thedevice shown in Fig. 3.

1. As may be seen from Fig. 1, the tubular 5' body which is wound as a flat bend-like form process by which it is upon a spool a is-conducted by the squeezing rollers b and 6 into the drawing chamber 0 and fastened to the nozzle e of the winding drum (1 Air is then blown through the nozzle e into the tubular body, whereb it is' inflated as far as the squeezing rollers 1 and b While blowing warm air through the tubes. f and f into the dr 'ng chamber, the tubular body is slowly cond iicted in the direction of the arrow through the dryin chamber at such a velocity that it leaves t e drying chamber at g in a dry state. The tubular body, is then wound up in a spiral upon the winding drum al which is also turned in the direction of the arrow. When the tubular bod' has been completely wound on the drum d; the tubular bod is cut ofl. and the tubular body emanating rom the dr ing chamber is fastened to the nozzle 0 o the second drum d while blowing air through the nozzle e into the tubular bod the further operations are carried out as a ove described.

2.v A modification of the above described possible considerably to increase the drying speed, is illustrated by Fig. 2. According to this method the tubular body is passed in several windings through the drying chamber. The wet tubular body wound in a flat band-like form upon the spool a is conducted between the squeezing rollers 6 and 6 into the dryin chamber a, it then leaves the drying cham er and after having been wound round the drum d, it 'reenters the'drying chamber. The tubular body is then carried around the drums e and f in several windings throughthe drying chamber and finally fastened to the nozzle h on the drum 9 During the drying process there is blown air through the nozzle it into the tubular bod travelling around the drum 91 in the directlon of the arrow. The dried tubular body leaving the drying chamber is also wound up on the drum 9 while being permanently lnflated. A

v Around therollers a and (1 of the dryin device shown in Figs. 3 and 4 there is woun in a spiral an india-rubber hose, if possible in as many windings as the capacity of the drums will allow. (See Fig. 4.) To the one end of the india-rubber hose is fastened the no we a hand-like tubular cellulose body which comes from the roll I) and has to be dried, whlle the other end is drawn over the nozzle d fastened firmly to a drum t so as to lie close on it. Then air is blown into the tubular body through the tube 7, the nozzle d and the ind erubber hose and by turning the drum t and and the rollers (1 and a the tubular body is wound in a spiral on the rollers a, and (1,, so 10 .that at first the india-rubber hose and then the tubular cellulose body S carried along are wound on the drum t. Hot air is simultaneously introduced into the dr ing chamber 0. The velocity of revolutions of the rollers and the temperature of the air are regulated in such a manner that the tubular bod leaves the apparatus in a dry state. It is then wound on the drum t while permanently inflating it until it completely covers the drum. The tubular body is then cut ofi before thejdrum t and drawn over the nozzle of the drum t Through the tube 1' air is reintroduced into the tubular body, which is then dried while permanently movin it, while the driedtubular body in an in ated' state is wound on the drum t The tubular body wound on drum t is then cut open at the nozzle d, the air is allowed to escape as much as possible and the tubular body is wound to on the spool p which thus takes place smooth- "ly and without there being any formation of folds. V a a It is advisable to mount the drums upon a slide in order to be able to move them to the 85 side while the tubular body is wound up so that the tubular body travels on the roller always. in the same direction and cannot turn round itself.

I claim: 4o 7 1. The process of drying tubular bodies of great length which consists in continually passin the tubular body in an inflated state throug a drying chamber in such a manner that it runs in a straight line inside the dry-- 48 ing chamber. I

' 2. The process of drying tubular bodies of great length which consists in passing the tubular body in an inflated state through a drying chamber in such a manner that it 50 runs in a straight line inside the drying chamber, and winding t e dried tubular body 1 in an inflated state on a drum.

3. Device for drying tubular bodies, which comprises a drying chamber, two drums, one 1'55 for winding off the tubular body, the other 7 for winding it on, the latter being provided with a-nozzle for the introduction of compressed air into the tubular bod to be dried. 4. Device for drying tubular odies which 00 comprises a drying chamber, two drums, one for winding of! the tubular body, the other fih'elmber, serving as a guide for the tubular I 5. Device for dryin tubular bodies which com rises a drying c amber, a drum for win ing off the tubular body, two squeezing rollers, a drum for winding on the tubular body, said drum I being provided with a nozzle for the introduction of compressed air into the tubular body to be dried.

6. Device for drying tubular bodies which comprises a drying chamber, a drum for winding oif the tubular body, two squeezing rollers, a drum for windin on the tubular body, provided with a nozz e for the introduction of compressed air into the tubular body to be dried and two rollers fitted outside the dryin chamber and serving as a guide a for the tu ular body.

In testimony whereof, I aifix my si ature.

I JULIUS oss. a.

for winding it on, the latter being'provided with a nozzle for the introduction of compressed air into the tubular body to be dried OI and two rollers fitted outside the drying 

